package cn.tedu.sp06.fb;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;

import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class OrderFB implements FallbackProvider {
    /**
     * 设置当前降级类,是针对哪个服务进行降级
     * -item-service:只针对商品降级
     * *:  对所有服务都应用当前降级类
     * -null: 对所有服务都应用当前降级类
     * */
    @Override
    public String getRoute() {
        return "item-service";
    }
    /**
     * 向客户端返回的响应*/
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;//500错的一个状态码

            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {
                //关闭下面方法中的流
                //ByteArrayInputStream 不占用任何底层系统资源,
                //所以不需要关闭

            }

            @Override
            public InputStream getBody() throws IOException {
                String json=
                        JsonResult.build().code(500).msg("调用后台服务出错").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h = new HttpHeaders();
                h.add("Content-type","application/json;charset=UTF-8");
                return h;
            }
        };
    }
}
